Vacuum cleaner



FIG. 1 is a perspective view of a vacuum cleaner showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a back elevational view thereof;

FIG. 4 is a right elevational view thereof;

FIG. 5 is a left elevational view thereof;

FIG. 6 is a plan view thereof; and,

FIG. 7 is a bottom view thereof. 

The ornamental design for a vacuum cleaner, as shown and described. 